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BitMap Contour To Windows Region

, 16 Sep 2005
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An article on how to generate an outline of a bitmap. Used when designing user shaped dialogs.

Sample screenshot

Introduction

The CBitmapHandling class was designed to calculate the contour points in a bitmap. It looks at the bitmap and finds pixel points different from white, it then places these start and stop pixel points in a Vertex of CPoint class. When it has found the outline of the bitmap, it then generates a Windows region. If you use this region in your OnInitDialog and then set the window region using SetWindowRgn(m_WinRgn, TRUE ), your window will then be shaped like the outline.

Using the code

The code consists of a header file and a CPP file.

//
#include "BitMapHandling.h"
using namespace HandlingBitmaps;

BOOL CMyShapedWindowDlg::OnInitDialog()
{
 CDialog::OnInitDialog();
 
 VERIFY( SetWindowPos( NULL, 0, 0, m_nW, 
         m_nH, SWP_NOMOVE | SWP_NOOWNERZORDER ) ); // size and pos. of window
         // cut of areas of region, which you do not really need. 
         // fx. maybe you have bitmap buttons drawn under your bitmap window.
 CBitmapHandling bh;
 bh.BitMapContourToWinRgn(&m_WinRgn, IDB_BITMAP);
 VERIFY( SetWindowRgn(m_WinRgn , TRUE ) );

 return TRUE; // return TRUE unless you set the focus to a control
}
//

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

serup
Software Developer (Senior) Nokia
Denmark Denmark
(BS.E.E)
I have been working with languages ranging from assembly 68000 to COBOL, OOC, MySQL, Perl, VC++ MFC and WinSockets.
 
I am currently working as a senior software architect at Nokia Mobile Phones Denmark
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Comments and Discussions

 
GeneralDemo Project Pinmembergancev18-Apr-07 3:14 
GeneralBitmap PinmemberSangeetha_J25-Jan-07 20:17 
Generalembedded systems Pinmemberjamal odibat18-Sep-05 21:05 
GeneralBetter solution Pinmemberserup31-Aug-05 2:15 
GeneralRe: Better solution Pinmemberserup31-Aug-05 2:35 
GeneralSome Bugs Pinmembernebbi27-Jan-04 21:47 
GeneralRe: Some Bugs Pinmemberserup28-Jan-04 20:32 
GeneralA guess (or two) at your low mark... PinmemberIain Clarke26-Nov-03 5:10 
GeneralRe: A guess (or two) at your low mark... PinsitebuilderUwe Keim26-Nov-03 5:25 
GeneralRe: A guess (or two) at your low mark... PinmemberIain Clarke26-Nov-03 5:33 

I confess I haven't read it in a while (most of my development is paid for, so
not really "put-up-here"able). I remember thinking he went over the top in some
places, but at least people should _actively_ choose to disregard bits, rather
than just ignoring them...
 
Iain.

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